Stoker mechanism



2 SHEETS-SHEET 2 M. P. LAUGHLIN. STOKER MECHANISM. FILED JULY 2 19194Jan. 2, 1923.

5 Z M o o m r K 5 J. 2 A 7 J x a F 52:

i T all aria-await may concern:

have such an arrangement l atented Jan. 2,

' NYRON P. LAU GHLI'N, OI?

PHILADELPNIA, PENNS LVANIA, ASSIGNOE to AMERICAN or PENNSYLVANIA.

s'roKEnmn'gnamsm.

Application filed 3111372, 1919. Serial No..sos,142.

Beit known that I, MYRON P. LAUGHLIN, a'citizen ofthe tnited States,residing in Philadelphia. Peimsylvania, have invented the Stokerllechanism, of which the following is a specification. 7

One, object of my invention is to provide a novel formbffuel feedingdevice for an aushall include a fuel liver fuel to the retortofsuch astoker but shall also cooperate with a piston as a fluid motordeveloping the power necessary for its operation on the fuel.

Another-object of my invention is to provide a feeding anechanism formechanical stokers, especially of the inclined underfeed type, whichshall be simple, compact and and nstruction of parts as will permit ofits being manufactured and operated at agreat-ly reduced cost ascompared with similar devices of the same clas sthe inventioncontemplating a novel motive power'device, one of whose elements shall.also serve as the ram or pusher whereby fuel is intermittently fed fromthe source thereof to the stoker furnace;

Another object of my invention is to pro vide a novel form of combinedram and motor cylinder designed to cooperate both with a fuel supplyingand guiding structure and also with a stationary piston to utilize thepower developed by fluid under pressure for delivering fuel to thefurnace of a stok'er.w

A further objectof the invention- 18 to J provide a novel form ofcombined ram and motor cylinder, together "witlra simple and substantialvalve mechanism for controlling the flowof motive fluid for saidcylinder.

These objects and other advantageous ends I attain as hereinafter setforth, reference being had to the accompanying drawings, in which, v

-Fig; 1 is a vertical section of an inclined underfeed stoker,illustrating my invention as applied thereto Fig. 2 is an end elevationon a larger scale than 1', illustrating the construction of the ramchamber and. part of its associated mechanism; 1

,Figs. 3 and4a're respectively vertical and Fig. 5 is a section on theline 5-5, Fig. 2, illustrating certain details of the valve mechanism vFig. 6 is a side elevation of the ram chamber showing the valveactuating cylinder and its associated parts; and

Fig. 7 is a longitudinal vertical section of the cylinder and piston foractuating the controlling valve. together with the pilot valve forsaidcylinder.

In the above drawings 1-5 represent portions of the frame work ofastoker, illustrated as of the inclined underfeed type, having in itsfurnace 6 any suitable number of sets of tuyeres 7 between each of whichsets are retorts 8 ;the tuyeres being supplied with air under pressurefrom a wind box I in the manner well known in this art and moreparticularly as found in the Taylor 'stoker.

Below and to the rear of the series of tuyeres T is a stepped grate 9slidable toward and from the bridge wall 10 well as parallel therewithand between sai wall and the grate is a dumping plate 11 normallysupported at a level below said stepped grate by a pawl structure 1:2whigh may be withdrawn or projected atwill. be agitated, and restored toits normal elevated position after being permitted to drop upon thewithdrawal of the pawl, by a suitable power' device such as the motor 13which is illustrated as a cylinder whose piston is connected through arod LL and a link 15 to an arm .16. This latter. through a tivelvconnected to said dumping plate 11.

For

horizontal sections on the lines 3-3 and This dumping plate may,

delivering fuel to each of the retorts and for feeding it out and downinto the furnace, I rovide afuel hopper '20 mounted across tl e front ofthe stoker and having its lower portion connected todeliver fuel bygravity to a horizontally elongated cylinder 'or ram chamber 21 whoserear end opens into the retort 8.

For forcibly moving the fuel from the' hopper out of the ram chamber 21into the retort, I provide a ram or pusherdelivered 22 in the form ofacylindrical structure reciprocable within, said chamber and in ac shownmy invention as applied to a stoker cordance with my invention, this ramitself constitutes the cylinder of a fluid motor, for it-is designed tocooperate with a piston 23 fixed relatively to the fuel receivingchamber 21 within which it is mounted. This piston is connected througha rod or stem 24 with. a plate. 25 constituting the head of the fuelchamber 21 and has the necessary packing rings to prevent leakage offluid around its edges. 'The front end of the ram 22 has fixed in or toit a head 26 provided with a stuffing box 27 to prevent leakage alongthe rod 24 and this latter has formed in it two longitudinally extendingassages- 28 and 29, of which the first opens on the rear face of thepiston 23 so as to be capable of delivering fluid to and exhausting ;itfrom the rear end of the ram cylinder 22,-. while the second passage 29opens on the front end of the piston 23 so as to deliver fluid to and exhaust it from the space between said piston and the head-26.

In the-particular case illustrated I have having an auxiliary fuelreceiving chamber or cylinder-30 in which a ram of the usualconstruction is reciprocable by means. of a rod 31, and this latter isactuated from the main ram 22 through a bar 32 constituting a leverfulcrumed' at .33 on a bar 34 pivoted to a fixed portion of the stokerstructure at435. The upper arm of saidlever; is pivoted to a lug 36projecting downwardly from the ram 22 through a slot 37 in the underpart of the ram chamber 21 and said lever is pivoted at 38 tothe outer-end of the rod 31 which drives the auxiliary ram. The

"retort 8, but likewise odically supplying motive fluid to *hausting itfrom the two ends of lower end of the lever 32 is connected through abar 39 and a rod 40 with the reciprocable grate 9, so that underoperating conditions the reciprocation of the main ram 22' in thechamber 21 not only causes fuel to be delivered from the hopper 20 tothe causes the ram in the cylinder 30 tobe reciprocated so as to as-SISt in feeding the fuel downwardly and out wardly in said retort. Atthe'same time the reciprocation. of the grate 9 further feeds the asheswith the partly consumed fuel therewith downwardly onto the dumpingplate 11 and also serves to cooperate 'with the bridge wall 10 incrushing any clinkers which may have formed.

. While my invention contemplates the use of any suitable form of valvegear for periand exthe ram cylinder 22, so as to cause this toreciprocate'in the chamber 21 at the desired rate of speed preferablyemploy the apparatus shown, in which the passages 28 and 29 in the fixedpiston rod 24 are extended laterally through the head 25 of said ramchamber 21 so that their outer ends terminate adjacent each other on theedge of said head.

For controlling the delivery of fluid to these passages I mount anelongated structure preferably on'the side of the ram supply pipe to twochannels 56 and 57 openlng on the face of the structure 50 in suchpositions that they respectively com- .municate with the ends of thepassages 28 and 29where these terminate on the edge of the head 25. v

F oroperating this main valve 54 I provide the second casing 52 with apiston 58' connected through a rod 59 with said main valve, to thiscylinder byva'pilot valve 60 mounted at one side of the structure 50.This valve has its movable element connected to and movable with a rod61, whose two opposite ends are connected through parallel arms 62 and63 to the ends of a second rod 64 threaded to receive two adjustableabutments 65 and '66, so positioned as to be engaged by an arm 67rigidly fixed to and movable with the ram cylinder 22. The arrangementof parts is such that the reciprocation of said cylinder through the arm67 causes the rod 64 and with it the valve rod 61 to bemovedlongitudinally as the ram cylinder 22 approaches either end of itsstroke. As a result the pilot valve is so moved as to allow motive fluidto enter one or the other end of the second or relay cylinder 52 andthereby, through the piston 58 and rod 59, shift the main valve 54 atthe proper time to cause motive fluid to be delivered to one or theother end of said ram cylinder, which is thereby moved in the ram'chamber to feed successive charges of fuel from the hopper to theretort.

andil control the flow of motive fluid- For regulating the operation ofthe piston 58 and main valve 54, I connectto the rod 59 a second piston70 operative in the dash pot casing 53. Oil or other suitable fluid isconfined in this cylinder and suitable means, whose detail constructionforms no partof the present invention, is provided for regulating thespeed at which this fluid may flow from one endjto the other of saidcasing and hence, the speed at which the pistons 70 and 58 with thevalve 54 may tmove in their respective casings or cylinders.

From the above description it will be noted that-I havemateriallysimplified and rendered more compact the fuel feedingmechanism for a stoker, since by utilizing the fuel feeding ram as a emenabled to develop the power for propelling the fuel. at the point whereit is tobe utilized without requiring it to be transmitted throughgearing mechanism. Moreover the stationary pismotor cylinder, I

or other forms of ton may be situated practically under the hopper andthe fuel receiving cylinder or ram chamber merely extended forwardly farenough and in such form as to provide a suitable guide for the ramcylinder.

1 claim:

1. A fuel feeding device for a stoker consisting of a fuel source; aretort; a cylinder connecting said fuel source and retort; a hollow fuelpusher operative in the cylinder to act directly on fuel from the sourceand formed to cut off the source from said cylinder while said pusher isdelivering fuel therefrom'to the retort; a relatively stationary pistonin the pusher; and means for supplying and controlling the admission andexhaust of motive fluid for the pusher to cause the same to bereciprocated in the cylinder.

2. The. combination in an inclined underthe second cylinder; and valvemechanism for supplying and controlling motive fluid to and its exhaustfro the second cylinder.

3. The combination in a 'stoker feeding mechanism of'a hopper; acylinder connected to receive fuel from the hopper under the action ofgravity; with a double-acting fluid motor having its movable memberclosely fitting into and reoiprocable in said cylinder and formed todirectly engage and discharge therefrom the material entering it fromthe hopper.

In witness whereof I aflix my signature. MYRON P. LAUGHLIN.

